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I want to define different css for the same input tag but apply to different type attribute. Is there any way I can do this without using class name or #id because I want to reserve the class name and id attribute for something else.

Randem's code is technically correct but unfortunately it uses advanced CSS selectors (which I think are from CSS3) which are currently only supported in Mozilla / NS7. Since you don't want to use IDs or classes the only solution is to "embed" the styles in a style attribute, for example: